Dubbo 版 Helloworld

使用工具：MAVEN、IDEA、Spring、Dubbo、Zookeeper

直接上代码

项目结构：

步骤如下：

搭建MAVEN项目，添加相关依赖

pom.xml

<!--Zookeeper-->
<dependency>
  <groupId>org.apache.zookeeper</groupId>
  <artifactId>zookeeper</artifactId>
  <version>3.4.6</version>
</dependency>

<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-framework</artifactId>
  <version>4.0.0</version>
</dependency>

<!--dubbo-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>dubbo</artifactId>
    <version>2.6.1</version>
</dependency>

dubbo-demo-consumer.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    <dubbo:application name="demo-consumer"/>
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.DemoService"/>
</beans>

dubbo-demo-provider.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd   http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <dubbo:application name="demo-provider"/>
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>
    <dubbo:protocol name="dubbo" port="20880"/>
    <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService"/>
    <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl"/>
</beans>

Provider.java

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class Provider {

    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("dubbo-demo-provider.xml");
        context.start();
        System.in.read();
    }
}

Consumer.java

import com.alibaba.dubbo.demo.DemoService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Consumer {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("dubbo-demo-consumer.xml");
        context.start();
        // obtain proxy object for remote invocation
        DemoService demoService = (DemoService) context.getBean("demoService");
        // execute remote invocation
        String hello = demoService.sayHello("world");
        // show the result
        System.out.println(hello);
    }
}

DemoService.java

package com.alibaba.dubbo.demo;

public interface DemoService {

    String sayHello(String name);

}

DemoServiceImpl.java

package com.alibaba.dubbo.demo.provider;

import com.alibaba.dubbo.demo.DemoService;

public class DemoServiceImpl implements DemoService{

    public String sayHello(String name) {
        return "Hello " + name;
    }

}

运行方式：打开本地Zookeeper服务，先运行Provider，再运行Consumer

运行结果：控制台输出Hello world,Zookeeper 服务器会输出几行信息：

打开一个Zookeeper客户端检查是否有节点存在